Identify the final product in the following r | vedclass

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(B) The reaction sequence represents the Umpolung (polarity reversal) of an aldehyde.$1.$ $R-CHO + HS-(CH_2)_3-SH \rightarrow$ cyclic thioacetal ($1,3

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$R-CD=O$

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(B) The reaction sequence represents the Umpolung (polarity reversal) of an aldehyde.$1.$ $R-CHO + HS-(CH_2)_3-SH \rightarrow$ cyclic thioacetal ($1,3$-dithiane derivative).$2.$ $n-BuLi$ (a strong base) removes the acidic proton at the $C-2$ position of the dithiane ring to form a carbanion.$3.$ $D_2O$ acts as an electrophile,adding a deuterium atom to the $C-2$ position.$4.$ Hydrolysis with $HgCl_2/CdCO_3$ in $H_2O$ removes the dithiane protecting group to regenerate the carbonyl group,resulting in the deuterated aldehyde $R-CD=O$.

Identify the final product in the following reaction sequence: $R-CHO$ $\xrightarrow{HS-(CH_2)_3-SH}$ $\xrightarrow{n-BuLi}$ $\xrightarrow{D_2O}$ $\xrightarrow{HgCl_2/CdCO_3, H_2O} \text{Product}$

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